Rendering artifacts when exporting to PNG with sketch mode on Firefox

[UvixCreative]

When exporting to a PNG in the D2 playground on Firefox, weird rendering artifacts appear.

Conditions:

• Any graph
• Any layout engine
• Sketch mode is enabled
• D2 playground
• On Firefox
• Export to PNG
• D2 version: v0.6.7-HEAD

This issue does not occur in Chromium, and it does not occur in Firefox when using the "watch" mode for d2 cli. I was not able to test this with exporting to PNG from CLI because I had problems getting playwright working and gave up.

thing -> other thing -> yet another thing

other thing -> example of a thing